Facile and controllable preparation of nanocrystalline ZSM-5 and Ag/ZSM-5 zeolite with enhanced performance of adsorptive desulfurization from fuel

Xiao, Yonghou; Fu, Junfen; Zhu, Heyang; Zhao, Qidong; Zhou, Liang

doi:10.1016/j.seppur.2022.120698

Cited by 24 publications

(4 citation statements)

References 53 publications

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“…Additionally, both fresh and regenerated catalysts displayed type IV N 2 adsorption–desorption isotherms with minimal changes in the specific surface area, pore volume, and average pore sizes around 2.7 nm (Figure S29 and Table S10). This confirms that the repetitive calcinations did not damage the overall framework structure . However, weak and strong acidity slightly declined from 0.816 and 0.248 mmol g –1 to 0.789 and 0.137 mmol g –1 after 10 cycles (Figure S30a), owing to aluminum removal from the framework upon multicalcination .…”

Section: Resultssupporting

confidence: 61%

“…This confirms that the repetitive calcinations did not damage the overall framework structure. 43 However, weak and strong acidity slightly declined from 0.816 and 0.248 mmol g −1 to 0.789 and 0.137 mmol g −1 after 10 cycles (Figure S30a), owing to aluminum removal from the framework upon multicalcination. 44 This is evident from the attenuated peak at 55 ppm and enhanced peak at 0 ppm in the 27 Al MAS NMR spectra (Figure S30b), corresponding to framework and extraframework aluminum species, respectively.…”

Section: Application Of Melting-catalysis Strategies To Depolymerizat...mentioning

confidence: 99%

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Highly Selective Upgrading of Polyethylene into Light Aromatics via a Low-Temperature Melting-Catalysis Strategy

Zhang,

Chen,

et al. 2024

ACS Catal.

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The selective upgrading of polyethylene waste into light aromatics is hampered by relatively high C−C bond cleavage temperatures and low product selectivity. Herein, we report a lowtemperature melting-catalysis strategy that directly upgrades lowdensity polyethylene (LDPE) into light aromatics over commercial ZSM-5 zeolite under mild conditions, eliminating the need for precious metals, solvent, or external H 2 . Experimental results combined with DFT calculations and molecular dynamics simulations revealed that the molten LDPE microenvironment facilitates intimate LDPE-catalyst contact, promoting primary C− C cleavage while suppressing olefin intermediates diffusion out of pores. This feature increases the residence time for subsequent direct olefin cyclization within the confined micropores. Moreover, online mass spectra confirmed that the in situ generated hydrogen from cyclization and dehydroaromatization reactions plays a vital role in C−C bond scission. By optimizing the reaction conditions, a light aromatic yield of 50.6 wt % with an impressive selectivity of 90.9% toward benzene, toluene, and xylenes was achieved at 280 °C for 1 h. This strategy is not limited to the model polyethylene but also demonstrates remarkable efficiency in the depolymerization of various widely used polyethylene-rich plastics, enabling an economically viable and environmentally benign chemical recycling path for plastic wastes.

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Section: Resultssupporting

confidence: 61%

Section: Application Of Melting-catalysis Strategies To Depolymerizat...mentioning

confidence: 99%

Highly Selective Upgrading of Polyethylene into Light Aromatics via a Low-Temperature Melting-Catalysis Strategy

Zhang,

Chen,

et al. 2024

ACS Catal.

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“…The reasons for the decrease in adsorption capacity of the regenerated adsorbent may be as follows: firstly, the calcination of spent adsorbents may lead to agglomeration of metal oxides on the surface of the regenerated adsorbents, which results in the partial inactivation of the adsorbents and a decrease in adsorption capacity. Secondly, oligomerization of NCCs occurred due to the calcination under air atmosphere, and the newly generated byproducts might block the pore of regenerated adsorbents . After three times regeneration, the saturated nitrogen capacity remained 66% for MF4 and 74% for MF5, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Secondly, oligomerization of NCCs occurred due to the calcination under air atmosphere, and the newly generated byproducts might block the pore of regenerated adsorbents. 56 After three times regeneration, the saturated nitrogen capacity remained 66% for MF4 and 74% for MF5, respectively. In addition, the spent Ce 0.2 Y adsorbent had better adsorption capacity than NaY within five cycles.…”

Section: ■ Experimental Sectionmentioning

confidence: 92%

Effective Adsorptive Denitrogenation from Model Fuels over CeY Zeolite

Zhang

Huang

Lin

et al. 2022

Ind. Eng. Chem. Res.

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Nitrogen-containing compounds (NCCs) in hightemperature coal tar have a negative impact on its utilization. This work aimed to prepare a series of Ce x Y adsorbents with superior capacity and selectivity by ion exchange, and further clarify the regeneration properties and adsorption mechanism. The adsorptive denitrogenation properties were evaluated at different temperatures using batch adsorption experiments in different model fuels. The implication of Ce loading on the adsorption properties has been studied. The results show that Ce 0.2 Y exhibits a remarkable performance in adsorption capacity. Ce 0.2 Y can reach 25.32 mg•N• g −1 absorption for quinoline and 23.78 mg•N•g −1 absorption for indole at 30 °C, which is much better than that of NaY. The effect of naphthalene on the adsorption of NCCs indicated that Ce 0.2 Y is much resistant to the influence of naphthalene. Furthermore, the regenerated adsorbents still retained better adsorption properties than NaY after five cycles. The adsorption mechanism for NCCs and naphthalene on Ce 0.2 Y was revealed by the IR spectra. By contrast, the interaction between Ce 0.2 Y and NCCs is stronger than the interaction between Ce 0.2 Y and naphthalene. The Ce 0.2 Y adsorbent preferentially adsorbed NCCs, which can be attributed to the introduction of Ce 4+ .

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Hydroconversion of n-octane over different MoO3 phase modified nanosized HZSM-5 zeolites

Xu,

Cai,

Wang

et al. 2024

Reac Kinet Mech Cat

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Facile and controllable preparation of nanocrystalline ZSM-5 and Ag/ZSM-5 zeolite with enhanced performance of adsorptive desulfurization from fuel

Cited by 24 publications

References 53 publications

Highly Selective Upgrading of Polyethylene into Light Aromatics via a Low-Temperature Melting-Catalysis Strategy

Highly Selective Upgrading of Polyethylene into Light Aromatics via a Low-Temperature Melting-Catalysis Strategy

Effective Adsorptive Denitrogenation from Model Fuels over CeY Zeolite

Hydroconversion of n-octane over different MoO3 phase modified nanosized HZSM-5 zeolites

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